/* mockturtle: C++ logic network library
 * Copyright (C) 2018-2019  EPFL
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/*!
  \file foreach.hpp
  \brief For each functor utilities

  \author Mathias Soeken
*/

#pragma once

#include <cstdint>
#include <type_traits>

namespace mockturtle::detail {

template <class Fn, class ElementType, class ReturnType>
inline constexpr bool is_callable_with_index_v =
    std::is_invocable_r_v<ReturnType, Fn, ElementType, uint32_t>;

template <class Fn, class ElementType, class ReturnType>
inline constexpr bool is_callable_without_index_v =
    std::is_invocable_r_v<ReturnType, Fn, ElementType>;

template <class Iterator, class ElementType = typename Iterator::value_type,
          class Fn>
Iterator foreach_element(Iterator begin, Iterator end, Fn&& fn,
                         uint32_t counter_offset = 0) {
    static_assert(is_callable_with_index_v<Fn, ElementType, void> ||
                  is_callable_without_index_v<Fn, ElementType, void> ||
                  is_callable_with_index_v<Fn, ElementType, bool> ||
                  is_callable_without_index_v<Fn, ElementType, bool>);

    if constexpr (is_callable_without_index_v<Fn, ElementType, bool>) {
        (void) counter_offset;
        while (begin != end) {
            if (!fn(*begin++)) {
                return begin;
            }
        }
        return begin;
    } else if constexpr (is_callable_with_index_v<Fn, ElementType, bool>) {
        uint32_t index{counter_offset};
        while (begin != end) {
            if (!fn(*begin++, index++)) {
                return begin;
            }
        }
        return begin;
    } else if constexpr (is_callable_without_index_v<Fn, ElementType, void>) {
        (void) counter_offset;
        while (begin != end) {
            fn(*begin++);
        }
        return begin;
    } else if constexpr (is_callable_with_index_v<Fn, ElementType, void>) {
        uint32_t index{counter_offset};
        while (begin != end) {
            fn(*begin++, index++);
        }
        return begin;
    }
}

template <class Iterator, class ElementType = typename Iterator::value_type,
          class Pred, class Fn>
Iterator foreach_element_if(Iterator begin, Iterator end, Pred&& pred, Fn&& fn,
                            uint32_t counter_offset = 0) {
    static_assert(is_callable_with_index_v<Fn, ElementType, void> ||
                  is_callable_without_index_v<Fn, ElementType, void> ||
                  is_callable_with_index_v<Fn, ElementType, bool> ||
                  is_callable_without_index_v<Fn, ElementType, bool>);

    if constexpr (is_callable_without_index_v<Fn, ElementType, bool>) {
        (void) counter_offset;
        while (begin != end) {
            if (!pred(*begin)) {
                ++begin;
                continue;
            }
            if (!fn(*begin++)) {
                return begin;
            }
        }
        return begin;
    } else if constexpr (is_callable_with_index_v<Fn, ElementType, bool>) {
        uint32_t index{counter_offset};
        while (begin != end) {
            if (!pred(*begin)) {
                ++begin;
                continue;
            }
            if (!fn(*begin++, index++)) {
                return begin;
            }
        }
        return begin;
    } else if constexpr (is_callable_without_index_v<Fn, ElementType, void>) {
        (void) counter_offset;
        while (begin != end) {
            if (!pred(*begin)) {
                ++begin;
                continue;
            }
            fn(*begin++);
        }
        return begin;
    } else if constexpr (is_callable_with_index_v<Fn, ElementType, void>) {
        uint32_t index{counter_offset};
        while (begin != end) {
            if (!pred(*begin)) {
                ++begin;
                continue;
            }
            fn(*begin++, index++);
        }
        return begin;
    }
}

template <class Iterator, class ElementType, class Transform, class Fn>
Iterator foreach_element_transform(Iterator begin, Iterator end,
                                   Transform&& transform, Fn&& fn,
                                   uint32_t counter_offset = 0) {
    static_assert(is_callable_with_index_v<Fn, ElementType, void> ||
                  is_callable_without_index_v<Fn, ElementType, void> ||
                  is_callable_with_index_v<Fn, ElementType, bool> ||
                  is_callable_without_index_v<Fn, ElementType, bool>);

    if constexpr (is_callable_without_index_v<Fn, ElementType, bool>) {
        (void) counter_offset;
        while (begin != end) {
            if (!fn(transform(*begin++))) {
                return begin;
            }
        }
        return begin;
    } else if constexpr (is_callable_with_index_v<Fn, ElementType, bool>) {
        uint32_t index{counter_offset};
        while (begin != end) {
            if (!fn(transform(*begin++), index++)) {
                return begin;
            }
        }
        return begin;
    } else if constexpr (is_callable_without_index_v<Fn, ElementType, void>) {
        (void) counter_offset;
        while (begin != end) {
            fn(transform(*begin++));
        }
        return begin;
    } else if constexpr (is_callable_with_index_v<Fn, ElementType, void>) {
        uint32_t index{counter_offset};
        while (begin != end) {
            fn(transform(*begin++), index++);
        }
        return begin;
    }
}

} // namespace mockturtle::detail
